diff --git a/libcryptomarket/api/poloniex_api.py b/libcryptomarket/api/poloniex_api.py
index 1b9c883..a6ac77d 100644
--- a/libcryptomarket/api/poloniex_api.py
+++ b/libcryptomarket/api/poloniex_api.py
@@ -1,5 +1,11 @@
 #!/bin/python
 import requests
+import hmac
+import hashlib
+import urllib
+from functools import partial
+
+from libcryptomarket.api.rest_api_connector import RestApiConnector
 API_URL = "https://poloniex.com/public?command="
 VALID_PERIODS = [300, 900, 1800, 7200, 14400, 86400]
 
@@ -58,3 +64,116 @@ def get_return_order_book(currency_pair, depth=10):
         raise ValueError("Query error from Poloniex API ({0})".format(rjson))
 
     return r.json()
+
+
+class PoloniexApi(RestApiConnector):
+    """Poloniex API.
+    """
+
+    URL = 'https://poloniex.com/tradingApi'
+
+    AVAILABLE_TRADING_API = [
+        "returnBalances",
+        "returnCompleteBalances",
+        "returnDepositAddresses",
+        "generateNewAddress",
+        "returnDepositsWithdrawals",
+        "returnOpenOrders",
+        "returnTradeHistory",
+        "returnOrderTrades",
+        "buy",
+        "sell",
+        "cancelOrder",
+        "moveOrder",
+        "withdraw",
+        "returnFeeInfo",
+        "returnAvailableAccountBalances",
+        "returnTradableBalances",
+        "transferBalance",
+        "returnMarginAccountSummary",
+        "marginBuy",
+        "marginSell",
+        "getMarginPosition",
+        "closeMarginPosition",
+        "createLoanOffer",
+        "cancelLoanOffer",
+        "returnOpenLoanOffers",
+        "returnActiveLoans",
+        "returnLendingHistory",
+        "toggleAutoRenew",
+    ]
+
+    def __init__(self, public_key, private_key, logger=None):
+        """Constructor.
+
+        :param public_key: Public key.
+        :param private_key: Private key.
+        """
+        RestApiConnector.__init__(self, url=PoloniexApi.URL, logger=logger)
+
+        self.__public_key = public_key
+        self.__private_key = private_key
+
+    def __getattr__(self, name):
+        """Get attribute.
+        """
+        if name in PoloniexApi.AVAILABLE_TRADING_API:
+            return partial(self._request, command=name, http_method="POST")
+        else:
+            raise AttributeError("Trading method ({0}) ".format(name) +
+                                 "is not defined.")
+
+    def _request(self, command, **kwargs):
+        """Send request.
+
+        :param kwargs: Named arguments.
+        """
+        kwargs["command"] = command
+        kwargs["nonce"] = self._generate_nonce()
+
+        return self._send_request(
+            command="",
+            http_method="POST",
+            public_key=self.__public_key,
+            private_key=self.__private_key,
+            params=None,
+            data=kwargs)
+
+    def _generate_auth(self, public_key, private_key):
+        """Generate authentication.
+
+        :param public_key: Public key.
+        :param private_key: Private key.
+        """
+        return None
+
+    def _generate_headers(self, command, http_method, params, data,
+                          public_key, private_key):
+        """Generate headers.
+
+        :param command: Command.
+        :param http_method: HTTP method, for example GET.
+        :param params: Parameters.
+        :param data: Data.
+        :param public_key: Public key.
+        :param private_key: Private key.
+        """
+        signature = hmac.new(private_key.encode(),
+                             urllib.parse.urlencode(data).encode(),
+                             digestmod=hashlib.sha512).hexdigest()
+        header = {
+            'Key': public_key,
+            'Sign': signature
+        }
+
+        return header
+
+    def _format_data(self, data):
+        """Format the data to exchange desirable format.
+
+        :param data: Data.
+        """
+        if data is None:
+            return ""
+        else:
+            return data
diff --git a/libcryptomarket/api/rest_api_connector.py b/libcryptomarket/api/rest_api_connector.py
new file mode 100644
index 0000000..39323e8
--- /dev/null
+++ b/libcryptomarket/api/rest_api_connector.py
@@ -0,0 +1,105 @@
+#!/bin/python
+import requests
+import urllib
+import json
+from time import time
+
+
+class RestApiConnector(object):
+    """REST API connector.
+    """
+
+    def __init__(self, url, logger=None):
+        """Constructor.
+
+        :param url: URL address.
+        :param logger: Logger. Default is None.
+        """
+        self._logger = logger
+        self._url = url
+
+    @classmethod
+    def _generate_nonce(cls):
+        """Generate an increasing unique number.
+        """
+        return int(round(time() * 1000))
+
+    def _generate_headers(self, command, http_method, params, data,
+                          public_key, private_key):
+        """Generate headers.
+
+        :param command: Command.
+        :param http_method: HTTP method, for example GET.
+        :param params: Parameters.
+        :param data: Data.
+        :param public_key: Public key.
+        :param private_key: Private key.
+        """
+        raise NotImplementedError("Not yet implemented.")
+
+    def _generate_auth(self, public_key, private_key):
+        """Generate authentication.
+
+        :param public_key: Public key.
+        :param private_key: Private key.
+        """
+        raise NotImplementedError("Not yet implemented.")
+
+    def _format_data(self, data):
+        """Format the data to exchange desirable format.
+
+        :param data: Data.
+        """
+        raise NotImplementedError("Not yet implemented.")
+
+    def _send_request(self, command, http_method, public_key, private_key,
+                      params=None, data=None):
+        """Send request.
+
+        :param command: API command.
+        :param http_method: Http method.
+        :param api_key: API key.
+        :param params: Input parameters, which will be parsed
+                       as "?key1=value1...".
+        :param data: Data.
+        :return: JSON object.
+        """
+        http_method = http_method.upper()
+        if http_method == "DELETE":
+            R = requests.delete
+        elif http_method == "GET":
+            R = requests.get
+        elif http_method == "POST":
+            R = requests.post
+        else:
+            raise ValueError("Http method must be either DELETE, GET or "
+                             "POST.")
+
+        url = urllib.parse.urljoin(self._url, command)
+        data = self._format_data(data)
+        headers = self._generate_headers(command, http_method, params,
+                                         data, public_key, private_key)
+        auth = self._generate_auth(public_key, private_key)
+
+        if self._logger is not None:
+            self._logger.info(">>> OUT:\n%s" % json.dumps({
+                "Method": http_method,
+                "Url": url,
+                "Params": params,
+                "Data": data,
+                "Headers": headers
+            }))
+
+        if auth is None:
+            response = R(url, params=params, data=data, headers=headers)
+        else:
+            response = R(url, params=params, data=data, headers=headers,
+                         auth=auth)
+
+        if self._logger is not None:
+            self._logger.info("<<< IN:\n%s" % json.dumps({
+                "Status code": response.status_code,
+                "Text": response.text
+            }))
+
+        return response